SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1d27209396419764cd80772e9b1218d14d4e14bf8604e559d1247ce358d62ad1' 
  AND token = 'CyUbijnDr2whUVUFHtll9HvLDYWbxC+gug1qEIfDvRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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