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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f6445a32aae04938763d704c0fcdb31c4dfba9ea0788f9517fd162f9a1c95cf8' 
  AND token = '1F4PrEdGIxGeccVtPvC0bQDkNJ0Dk9ykmwB+RBf9Hj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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