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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a654ba42d2567b74dffd8012d2167eae1744242bc71ab6aad9b007e13015b82d' 
  AND token = 'DTF+ku62H+AHfDZxU7p/4DbfamNnbMyzqB9oI+4IIAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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