SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '00323b1e2fa311d4860c7d61d93add990d49056e53e790d77e3183439a7f85f4' 
  AND token = 'F+AZP9avzyAs/PWRQsOcYWJkYrECJuACffmhHeccUp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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