SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cd5d215899369fe5cd65d9c63d144cf6ff0c242d08eecd47a4c24ef6ba50fbd5' 
  AND token = 'VKiKNBQNGUuc7CzY6Q/GGhP4zwqv4EX4628AnmjbwTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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