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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9f38ca4319412fd7b0d2c4912aa35bab15b53c2c23a8d87c0832b4a36a920995' 
  AND token = '7DkEu3wpTFNOZca/8K+/YDnXz6t8+Lsq2wXt+Aw9f40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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