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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dcf230b2dabc16b81e8b6830bd89b3d5e11b49f50c35c3000bd990537eb578ac' 
  AND token = 'p4Y23ttJ+eKJ9Xmn3P2NA8PJxghuRLcg1xM3g17xPwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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