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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '20bdc4329727c6c883fe619da83b6041737bfc8656cc5550ce4032532e7cf640' 
  AND token = 'yDcTGE75pN9AKONGs02hAVtdF5SpnS4mwr7c+hFW6IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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