Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7937c79c390a2fe00aa1287cedfe743d5b866747743643fb260fe1ed1f97f1' 
  AND token = '7lZoXba/arjm5lWlXIlBWMBuYUiiEVlNjhe5ky8camE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}