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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2382f7e9c4749d6d08316a6ffee24241f43ec8e84896f3572bbee98e7d67783b' 
  AND token = 'J+mzQz2xORBaVyPC11z4zFVN2TfbXmAunn9jwzLTq3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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