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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '440ff921793bb39a24179e684dec8dd14d3cdc14761b1e1fa0e7e6431226e402' 
  AND token = 'FhNUSehIivkKAiNhWrEUuOnJ3myl5OsfB7liUiOrk+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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