Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9bf7ffe676893a0b1fe8ce3cbf6dfc74d213b89feff7590ab5d4be525c5023a' 
  AND token = 'rJkKTLiqp5Nggy0DLE9fTHgsyHECk/2lblewCeZ/eD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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