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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a1a5b898601707223980eda9456bb83eb35d52f8e6af3cdc60745f30fa5b2557' 
  AND token = '/vueZ3/6Eu0oLphUwke1dJrES2vfpdrtT9aqSSG5U/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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