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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'baef15e4091bbb5907f5eca06b63ab2130f45d84602698816833a362aa931cff' 
  AND token = '8Haks/PvheSOXclTa/XJ5nRELbkz0NeFeEcUZykJdA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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