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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7f489596f0f3dbf70f0152723d75c1ac5d20fa01df6b4bf0320b2efc970918f7' 
  AND token = 'qXEKe8lCJ33mFaA31VpErYB2blqDNdC9MQgzrQLpVsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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