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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ec170e0ac2853b3791517c84669c66f59c5b4e088f22ce6b893c2842e1f1b5dc' 
  AND token = '086n4byvi37RAOexkt49+fDJaq3liDrB2NcUxLcpyLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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