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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f9668f9b5fdfb625f09998c2cefb96cf412aff68fd0a85be7f408e9ee2be9dfb' 
  AND token = 'e1aLX6Zp0ASH1oABatdfOXfR3Xaa6udYTH+076s+kS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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