SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f206577e3c4103dfeb25a1056cbd0ae1f09f65976511638d875d95f4bc7f8832' 
  AND token = 'ronA1v2AprCQGEjqbt4dQ7+4pg4hBRKkh8q7kT/XkZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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