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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b93707934524ddb7b8f7c9704b952d1af788f7e8a8c87343bde05d953db5551c' 
  AND token = '4ZXgm21TeFuOGMErRe4dPCCRirPR06x7zX/lnkKmh3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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