Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e68cf12e3b2150b6bef5e66a2b437a1e9a5aa37ea2416671edd81d90e136d265' 
  AND token = 'mgPiN5eMuoAmnmxjHk4oUueAWycmxwroiFIjb97m20w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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