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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bc3705c35aa541ace7c32ae251d14017a7a825a4418f474102364933e973d9b4' 
  AND token = 'm+B/5AEwOQuVKlP64fDSG9Bz7aCIc+CVOTI+xEml4ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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