Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a87de803c446ed6bcecdcd230cd16d6c283619ad37c1adcf26bc27f44e0a22' 
  AND token = 'Ikgs6ZtsD6y4Yu+lM1ylcT7wGAiE+93WE1LZ/a9VtCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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