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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5a8fbab19ba2cf434c87c94417991ca1d22a8b1f45dea3eb47df63e33d59bc68' 
  AND token = 'FycKL+8Q6z0t3N9+fdSp7O5ra1OBuEFS3ImDGNlY34o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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