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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '99447357a951a43b7e26d65baf923ad91548fdb248f9213a14a72be58a331e76' 
  AND token = 'E1qmpKv5NXgSqH4rViD3t10sNUMj7PyC869hCWdOZlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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