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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '05bdd51c0a9c2dc6bf070efea814d8f4d78139c6a8ba7672d0e8cb7488b29dd3' 
  AND token = 'kDsDXd1nqgp11BNbXlFKQ5+kHq0hovh1GTHSA8V1NMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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