Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275b7f27237ff608961e1e78ab829a43101dba0abfd1793afc73fd8d2db99049' 
  AND token = '3rlp5ZJ0OhAS3R88lYgraMrgjP/HN949cE30RBcJLvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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