Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301d6c83d48b3e2d725f30c29240103cc2633c3ed591debfd10b71ae5f5db568' 
  AND token = 'KZDnT2KnOfMUzCYVF78cY9HQrF+QIJ75yxoGYlIholU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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