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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8e75a08e62e2276028f74deb38a3888644a49a277080d5d2d23c34436ec0fdfd' 
  AND token = 'CrKDe+9qvcVvRfHiBmyAZuMoXljHncRp0rfCLzPxUB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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