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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '2e531cf947b92ab2b5de3d5e13305f31e54d28a753bf34c0ca56a77d3099bab3' 
  AND token = '1HrltuqSj5jzKOoQFufYft3Yqpk+7Uu0pOmc0dmnLeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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