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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fc8b2af28d24525c0baf996510e209a62c582333f98ed6302ab1de10082634e8' 
  AND token = 'BZFak/vH3CCzh1juDxlW3fPtRfXK/RkX9dXlF2FFOpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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