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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2ba6ed4a0bd1b02201808d0642562abf25a4adfba5dc6b20a46268d943e2933b' 
  AND token = 'qn1ry/TSuB0iKP+WC7IkpdobwSDJwapZtf+GOO3ZCF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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