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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b2c3b27ec9fca7f9b18fa98282af468a9b3790454af4ee28931ca3b5487a7227' 
  AND token = '8wl058+L3XBAC3fqF+b0NF0KPOdyWRm1bluwA8y6H74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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