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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8d2c2714074ef59dc9f3cea7cfc88d22e06a3a35b1bd30e1b41a1f231e1c546e' 
  AND token = '/5W6/zI8I3O/aQ+cR7jJ5cCC89+QWYbtLotYmkTY7Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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