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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '16e988314fd4cc61b6d31b54d4af5bfb4d89a4a32695735c9ecec3e695b80ca6' 
  AND token = '8qKg4svUBQqRMjcz/d1FbRjs1mRei8aNDBip2p+o5Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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