Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e6e1f54fc3fe3a94fad52ddf2756c9261d19d14a69269da0083d19a582cde7' 
  AND token = 'WHvodhPNuMctQV83aCLJ4JuOWlPHnsQwat9eaAKnMiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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