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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '39825fdc4c94844df1c218265f01b63f91588f39bbd6329503f662a067539902' 
  AND token = 'lCiSRUdHI5Vs1na0DafdX86SYee/xOiB6EZdYrpW8+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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