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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5349c5d3d99eaa02fa246637f074e6379a8947215e45b3138edd3d1a19c07d32' 
  AND token = 'Ia8MZimqar4VDU8u8/CIqi/Gk0lt0P5+gfczbggdXLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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