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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '38701d4ed8b285a86eee747c0419082d5e1984a4f9c21a2fa8f99052dc1971ac' 
  AND token = 'bzTHbmaPXrlFTKU6kwIqHOuTlibYLno2nV9kBLPZdfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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