Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4392893e6d44fc169dba06b018d087483ec226c3c643bbcf84289608ef994aa' 
  AND token = 'QFrANGhNMSkvNjX2lBJn87/1qA89G8OWkkDceRpwczk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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