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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '617368750d940a6ffdba9fdc812893c13ebe7d2473e480a27b78d9d67286e04d' 
  AND token = 'DI6mlLoe1O/GlL9JST6Kt4iNsxU0x8uqD5ufsZopeNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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