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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'af5e58dd49f77e7c8009af7624c4e2d63e53237e1fffbae7cdf99c923f0712ab' 
  AND token = 'FEbdOmH8PCiJvtHZDRwfx3zf9jr5mPmJI+rMiySYEuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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