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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '96b2c98beccef8ffcbc21e5528f3d04444c35bedb078ef11b629d8cb43dee2a7' 
  AND token = 'QAKZi2/LFRxf/qpSDSFGQdeECMdxfgNSJjzWJ1E9UOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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