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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9282aeac8636ff80e6fac5c5343345a28ce27d6a757cac579edfdf38ac0a95c9' 
  AND token = 'ddAT9wdtnP6Bdl1JfubjcGYU35uXyCpqzPOnJxMsGlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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