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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '1681e7ff9d0d3edc64daab7d0c77667df714de4a9185191f95ae406c924c21c2' 
  AND token = 'PLcxveRFYhzldUItdEha2qcdaY8Pxhbt5ffdOU2crjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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