SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd8d0093bb621c1ca7b4206703c980edff02f24712b1a1d4dafb956a294cb8712' 
  AND token = 'os5vtI9MUF4HMgwKEdmzNrjZGYsDnojKaicGu2Oa7Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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