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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a400429a3dfa294cbfa0c30372d7621adfd14d4313599fc889e2ae9c5594b309' 
  AND token = 'fC8v0Y7lBsMtIJBflNwkPb5sqSw9UqKF2ueumMaQ2qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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