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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '55764cc097352d9a7af7ceca0051f566664395cfeaaaebe9ea81d554a1de8ed1' 
  AND token = 'lOeuxNmmozzANJ33o4bw2varzxB5g4mgx9XYJD3LAoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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