SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '10b2f5a47670e4e737221aa5306215e09c20858a9c556f0fbe767efc3d60af34' 
  AND token = 'xgBPzHCfUNV7J+s9vjqm7X8TZ69GHL4jbWbuskOGJBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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