Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd790d94c6fa0a884ee70045e51d85a7addc05f3c9cdad4a24f785840e01c573f' 
  AND token = 'cs7+dn5Dlwzjj8QEI5yJR5sQoxn0QeCS01Qe98BY48c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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