Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3dea39d0c594872435e4a892c31879d8d86c043a8fb3d064d704f6b1e3f529d' 
  AND token = 'VYxLVEoVnC+kzkEqAAkirXoamU96qGsM2s1ngs38d3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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