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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b6fd32c1d3be4629d7b6e90a25dd9d4afc30aa756b7b7e90f31d56f45f017834' 
  AND token = 'maQkb7xLUrGBEaklDApTqtdorGUrmNN7+kms3Ndu+m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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