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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'aca2b9f11ce7eeaaf50ed9d5a11670e2be47abbd02eca3fac4a58d6318cce9fb' 
  AND token = '8E/+mZmEMbPNI6zwMQ9YyVkLKUkRTNx2bvo+ybuuc0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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