Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e839238ff91ca6fa44e3b2b594a488409adffdb1ffc8c823a7fbd107fa3d3e0a' 
  AND token = '/kjULN9HqvIBJI2N6IIvA+o5QHKtgvZKywGWarIEkHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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