SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd72fa03d8371a0807cb2a642071ddc5392fa4a8a0f904a2f39b9207688ec105f' 
  AND token = '+UwKwMPgSsyLt4+eYVBWEDVa488P9qt9UogfupQ8uMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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