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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '64344de4df11902056496a18e63f457be9796aa0e4dfe4a3f2d718cc8a72de0e' 
  AND token = '66ze75gXxLD7NMhGbRVd9VxdySDSJ8b5NvtOL4DvULs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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