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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '58e4d050c47a10c9f83124f4b8118a0673035fc5eea134224b871609d239eefb' 
  AND token = 'qsdu0JsVFojnhrU1kdBA009gnW/gosRQh43N2x0oGs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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