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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '065aeb3f6b701af403a1ec7e3e54a1de6de5797c840e34bd226d5ffb8363faea' 
  AND token = 'SJEAd2zAdk07zn5ukHyimkmk16i5LspkJPETZpazSUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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