SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7aa69fd07fe80bdd15c6e865cbbeb2438f87cef80d4160733f9b36de476db835' 
  AND token = '3eqgX58BrPzlS1DsPY0w14VVYRZPoNxryvN9ykhLRQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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