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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '838badd54cb737d2855be39e296a624e26d9e856f4398662e03003939cd389f5' 
  AND token = 'oI1m6Buz6A+79Gbc3MD8pDv87TgUyOfipVJxJD3Kfy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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