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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cf5ebfd2ac399fdf7ccedc4e882992d48b1fe7e21f05d9e522f046082ef3b6fd' 
  AND token = 'o26xFWK9fGxU88F5pS50l7DmDHM5xl+RaRroER3RUzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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