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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '266f452a4b22af571f2964e16f908fefd9845a76de49cb607700506eabf9aa8c' 
  AND token = '7Aq1ASk27BaZpjDvnRXcacEX0QWSy9x2Ll+sLuUfBbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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