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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9db93f1b167dacacef073d22dac0bc009c387094f07cd02011e3f8ad62805a0e' 
  AND token = 'TBjMxfYJj3Lpw/6uRMojkuQa/hdEHhio4PpGVLvR3ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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