SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b08dd899f1d42346cdb37196274e6385613f987be82f2670cb0acb22aa5452c4' 
  AND token = 'AErjFVXgXDvZ67l36JrlDSQAFMQVAf9Po4AERJOXNVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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