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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd81dd22eee66f2a8fa832728207dd0fe852f7a9130e112a0b63bca4edad6a87e' 
  AND token = '9EHLcx4Qdcl9I8wSWNDlqacmq9Bp1t9Ith8ngpjq0n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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