SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e8dc6f9dd156bd5b38cf2996784026678b0536b78f55b21468ead394861abb14' 
  AND token = '018k5g0LKFhgXGI/QFuwEfFFmH4zB3Qit67fxYDz9DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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