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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9339007036d03e41957d31b726aa39b256b32c1bf95aa550dc391d90ef6f99a2' 
  AND token = 'pjUxTp6xEmZjhM8qqgFu/TR5GQlPkpsTSkw16sQQpXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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