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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2e769d9fbed3e0da8d58c64096595849ba83ea437405c95506ea33fcd48a5eb7' 
  AND token = 'QnDE70p/62XN2kwlfiQ8ptVcqpDr0i9/6Vw/YKsPt1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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