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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cb207196f6f7ef38381e733252143ac0b2f1d8d59f34a4d39c45356176473128' 
  AND token = 'MJxoug8Pv5xggnqSvpImIIgDDYu80A2//lgqg/WSSpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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