Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7ad099aa0fbc2949ef36d55f0e1bbf4c1ba9caf92b4dd4766579acefa03c145d' 
  AND token = 'hka+KiZECsCby1XCv5TGtrKqPlUnEunwWmdcJm8tLsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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