SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9793b85f98dc8d1ce72115833820c252f0470d9364fe4026c006963bfa0c1a89' 
  AND token = 'bQqRF1GiMt6GbrfKapoWYTN8Pz10GsHZnwyz8aCtuBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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