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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3b49bd7b4115174e1967d11c18fa47b27a3061e76893a615a78e94b6a5fef9c0' 
  AND token = 'bQ7Vdm10GAMGRzDJPuYhtVnxgqu4lYEsikHIMHDUjkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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